Capacitive Behavior and Charge Storage Mechanism of Manganese Dioxide in Aqueous Solution Containing Bivalent Cations
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作者:
Xu, Chengjun
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Tsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Tsinghua Univ, Adv Mat Lab, Dept Mat Sci & Engn, Beijing 100084, Peoples R ChinaTsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Xu, Chengjun
[1
,2
]
Du, Hongda
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Tsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R ChinaTsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Du, Hongda
[1
]
Li, Baohua
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Tsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R ChinaTsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Li, Baohua
[1
]
Kang, Feiyu
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Tsinghua Univ, Adv Mat Lab, Dept Mat Sci & Engn, Beijing 100084, Peoples R ChinaTsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Kang, Feiyu
[2
]
Zeng, Yuqun
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Amperex Technol Ltd, Dongguan 523080, Guangdong, Peoples R ChinaTsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
Zeng, Yuqun
[3
]
机构:
[1] Tsinghua Univ, Grad Sch, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
[2] Tsinghua Univ, Adv Mat Lab, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
[3] Amperex Technol Ltd, Dongguan 523080, Guangdong, Peoples R China
Manganese dioxide shows an ideal capacitive behavior in the aqueous solution containing bivalent cations (Ca2+). A specific capacitance value as high as 310 F g(-1) in 0.1 mol L-1 Ca(NO3)(2) electrolyte was measured at a sweep rate of 2 mV s(-1). A cycle life test was also performed and no capacity loss of MnO2 electrode was found after 600 cycles, which indicates the MnO2 electrode possesses a good cycling property in the aqueous electrolyte containing bivalent cations (Ca2+). X-ray photoelectron spectroscopy data reveal that the Ca2+ ions in the electrolyte are involved in the charge storage process of manganese dioxide in an aqueous system and correspondingly a part of Mn4+ ions will become to Mn3+ ion to balance the charge.
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页码:A73 / A78
页数:6
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